Head to head
0
Hard
1
1
Clay
0
1
Grass
0
0
Carpet
1
Alex O'Brien's wins on the left · Kenneth Carlsen's on the right · bar lengths share one scale
All meetings (4)
| 1998 | Wimbledon | Grass | R128 | Alex O'Brien | 4-6 4-6 6-4 6-3 6-4 |
| 1997 | Ostrava | Carpet | R32 | Kenneth Carlsen | 7-6(8) 6-7(6) 7-6(9) |
| 1997 | Beijing | Hard | QF | Kenneth Carlsen | 7-5 5-7 7-6(4) |
| 1997 | Orlando | Clay | R16 | Alex O'Brien | 2-6 6-3 6-2 |
Methodology
Head-to-head totals and surface splits exclude walkovers (no match was played), which follows ATP convention — walkover meetings still appear in the match list. The momentum chart plots the running lead across all counted meetings, oldest to newest.